*{
    margin: 0;
    padding: 0;
    list-style: none;
}
#big{
    background: url(/img/beijin.jpg);
    width: 100vw;
    height: 100vh;
    background-repeat: no-repeat;
    background-size: cover;
    display: flex;
    justify-content: center;
    align-items: center;
}
.main{
    width: 30vw;
    height: 20vh;
    background-color: antiquewhite;
    display: flex;
    justify-content: center;
    align-items: center;
    
}
.text{
    width: 13vw;
    height:2vh ;
}

.from{
    width: 10vw;
    height: 15vh;
    display: flex;
    justify-content: center;
    align-items: center;
    flex-wrap: wrap;
}